Friction stir welding tool with shoulders having different areas; methods using such tool; product welded with such tool

a technology of friction stir and shoulder, which is applied in the direction of manufacturing tools, soldering devices, auxillary welding devices, etc., can solve the problems of inferior quality of joints, increased labor intensity, and inapplicability of known conventional fsw tools, so as to increase the production rate, increase the specific strength-to-weight ratio, and increase the heat input
US20140119814A1Active Publication Date: 2014-05-01SAPA
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SAPA
Publication Date
2014-05-01

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Abstract

The present application relates to a friction stir welding tool (20) for joining two adjacent work pieces (10), which work pieces comprise portions (6) to be welded and having a narrow space there between on one side, said tool having an axis of rotation, and comprising a first shoulder (1), a second shoulder (2), and a pin (3) arranged so as to connect the first and second shoulders, wherein said first shoulder has a first contact surface for friction heat generation to the work pieces to be joined during welding, said first contact surface having a first contact area, and said second shoulder has a second contact surface for friction heat generation to an opposite surface (5) of the same portions of the work pieces to be joined, said second contact surface having a second contact area, the first and second areas having different sizes, where the first area is a larger sized area than the second area. The application also relates to a method of joining work pieces, a product comprising joined pieces, and the use of such friction stir welding tool.
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Description

TECHNICAL FIELD

[0001] The present invention pertains to a friction stir welding tool, a method of joining work pieces, particularly having a complicated geometry, to a product comprising joined pieces, and the use of friction stir welding tool with improved access ability in narrow spaces and higher productivity.BACKGROUND OF THE INVENTION

[0002] It is known in the art to use a friction stir welding (FSW) for joining of two metal or plastic work pieces. In essence, FSW employs a non-consumable rotating tool, which interacts with the work pieces by its contacting surfaces to generate frictional heating and thus plasticizes the material in a weld zone. Local softening of the material in the weld zone facilitates mixing of material from the work pieces and upon translation of the tool along the welding direction the joint is formed. The plasticized material tends to run-off from the weld zone under process loads, which in turn might lead to formation of internal or surface breaking defec...

Claims

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